Augustus cooked his biscuits outside for three reasons. One was because the house was sure to heat up well enough anyway during the day, so there was no point in building any more of a fire than was necessary for bacon and eggs. Two was because biscuits cooked in a Dutch oven tasted better than stove-cooked biscuits, and three was because he liked to be outside to catch the first light. A man that depended on an indoor cookstove would miss the sunrise, and if he missed sunrise in Lonesome Dove, he would have to wait out a long stretch of heat and dust before he got to see anything so pretty.